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Here is an additional thought. I know that the results wont always come in the same, some might be positive. My objective is the removal of the OBX if this makes sense to anyone. However this is all test results.. this is NOT Live.

Prior to any transformation of an OBX field run your code For Each of the OBX. Then write your If = "Negative" statement. Instead of writing to remove anything just leave the immediate action blank and add your OBX transformation logic in the ELSE section. This will skip that segment when it meets the condition of your IF and you can always just renumber the OBX-1. Without knowing more, I'd do something like: